Rainbow-electronics MAX1791 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX1762/MAX1791

High-Efficiency, 10-Pin µMAX, Step-Down

Controllers for Notebooks

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ELECTRICAL CHARACTERISTICS (continued)

= 15V, VL enabled, C

= 1µF, C

REF

= 0.1µF, T

= 0 to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

(Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Reference Voltage V

= 4.75V to 5.25V, no load 1.98 2 2.02 V

Reference Load Regulation I

REF

= 0 to 50µA 0.01 V

REF Sink Current REF in regulation 10 µA

REF Fault Lockout Voltage Falling edge 1.6 V

Output Undervoltage Threshold

(Foldback)

With respect to regulation point, no load 60 70 80 %

Output Undervoltage Lockout

Time (Foldback)

From SHDN signal going high V

OUT

< 0.6 x

regulation point

10 20 42 ms

Current Limit Threshold V

ILIM

-90 -100 -110 mV

Thermal Shutdown Threshold Hysteresis = 10

C 160

VL Undervoltage Lockout

Threshold

Rising edge, hysteresis = 20mV, PWM

disabled below this level

4.1 4.4 V

DH Gate Driver On-Resistance V

= 6V to 20V, measure at 50mA 5 8 Ω

DL Gate Driver On-Resistance

(Pullup)

DL, high state, measure at 50mA 5 8 Ω

DL Gate Driver On-Resistance

(Pulldown)

DL, low state, measure at 50mA 1 5 Ω

DH Gate Driver Source/Sink

Current

= 3V, V

= 6V 0.6 A

DL Gate Driver Sink Current V

= 2.5V 0.9 A

DL Gate Driver Source Current V

= 2.5V 0.5 A

SHDN Logic Input High

Threshold Voltage

1.6 V

SHDN Logic Input Low

Threshold Voltage

0.6 V

MAX1762 V

OUT

= 1.8V fixed

MAX1791 V

OUT

= 3.3V fixed

50 100 150 mV

MAX1762 V

OUT

= 2.5V fixed

Dual Mode Threshold Voltage

MAX1791 V

OUT

= 5V fixed

2.5 3.25 4 V

SHDN Logic Input Current SHDN = 0 or 5V -2 2 µA

1 2 3 4 5 6 7 8 ... 19 20

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